The population standard deviation (σ) for a standardized achievement test that is normally distributed is 8.
a.) Calculate the standard error of the mean if you draw a random sample of 50 test scores. Show your work for full credit . . .
b.) Your sample mean is calculated to be 77. Compute the 95% confidence interval for the mean. Show your work!
c.) Interpret the meaning of the 95% confidence interval in one sentence.